For married folk: the worst fight you had

What was the worst fight you had with your spouse? What was it about? How long did it last? How did it get resolved?

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It may not be the worst but it's the one that sticks out in my mind the most, we were about to take an overnight train in Norway and my OH said something about me asking my parents for a laptop for my birthday because he wanted one and I got really mad that he'd try and get me to get my parents to buy him something expensive.
We argued pretty much the whole night and couldn't leave because we were stuck in this tiny berth